Dalzil and Pascoe arrive in Amsterdam at a conference of police detectives. Local police greet them with undisguised irritation. Dalsil meets a young singer and spends the night with her, and in the morning he sees that her throat was cut. Andrew becomes a suspect in this murder.

Dalzil and Pascoe arrive in Amsterdam at a conference of police detectives. Local police greet them with undisguised irritation. Dalsil meets a young singer and spends the night with her, and in the morning he sees that her throat was cut. Andrew becomes a suspect in this murder.